his wife probably had no opportunity to get to a weapon, and would not have been carrying one if her husband had been armed.
I know dozens of women who carry regularly. To the best of my knowledge, none of them disarm simply because their husbands are armed.
When I encounter a student who says something like, "Well, I don't need to carry a gun because my husband does," I (gently!) help her see the serious error in that kind of thinking.